Supermarket giant Tesco is back in the grey area of retailing this week, after defying the efforts of Sony to control the numbers of its PlayStation 2 games console available on the UK market. When it was launched last month, Sony was heavily criticised for limiting UK availability of the new must-have in games technology to only 165,000 consoles, but now Tesco has inflamed the electronics giant by importing a hoard of around 2,500 from a "secret location" in northern Europe.